Function, Consumer Functional Interfaces

FunctionalInterfaces.java

// Function, Consumer

        Stream.of(strings).filter(s -> s.matches("\\d+")).map(new Function<String, Integer>() {
            /**
             * Applies this function to the given argument.
             *
             * @param s the function argument
             * @return the function result
             */
            @Override
            public Integer apply(String s) {
                return Integer.parseInt(s);
            }
        }).forEach(new Consumer<Integer>() {
            /**
             * Performs this operation on the given argument.
             *
             * @param o the input argument
             */
            @Override
            public void accept(Integer o) {
                System.out.println(o);
            }
        });


        Stream.of(strings).filter(s -> s.matches("\\d+")).map(s -> Integer.parseInt(s)).forEach(s-> System.out.println(s));

        Stream.of(strings).filter(s -> s.matches("\\d+")).map(Integer::parseInt).forEach(System.out::println);